3 Spectrum Analyzer Mode
3.3 Channel Power Measurement
frequency, center frequency, start frequency, stop frequency, and all other absolute
frequency settings in the instrument, including frequency count. When a frequency
offset is entered, the value appears below the center of the graticule. To eliminate
an offset, perform a Mode Preset, or set the frequency offset to 0Hz.
See "More Information" on page 632.
Remote Command
[:SENSe]:FREQuency:OFFSet <freq>
[:SENSe]:FREQuency:OFFSet?
Example
:FREQ:OFFS 10 MHz
:FREQ:OFFS?
Notes Preset and Max values depend on Hardware Options
Dependencies Appears only in Spectrum Analyzer Mode
Freq Offset is not available in External Mixing. In this case the control is grayed-out and shows a value
of zero. However, the value of CF Offset that was set for the RF Input is retained and restored when
you switch back to the RF Input
Preset See "Center Frequency Presets" on page 623
State Saved Saved in instrument state
Min/Max –/+500 GHz
Annotation If Frequency Offset is not zero, “Freq Offset <value>” appears on the upper line of the annotation,
below the graticule, in the center
Status Bits/OPC
dependencies
Non-overlapped
Backwards
Compatibility SCPI
:DISPlay:WINDow[1]:TRACe:X[:SCALe]:OFFSet
The DISPlay version of the command is in the instrument for compatibility across platforms and is
not recommended for new development
More Information
This command does not affect any bandwidths, nor the settings of relative frequency
parameters such as delta markers or span. It does not affect the current hardware
settings of the instrument, but only the displayed frequency values. Entering an
offset does not affect the trace position or display, just the value of the start and
stop frequency and the values represented by the trace data. The frequency values
of exported trace data, queried trace data, markers, trace data used in calculations
such as N dB points, trace math, etc., are all affected by Freq Offset. Changing the
offset, even on a trace that is not updating, immediately changes all the above,
without taking new data.
NOTE
If a trace is exported with a nonzero Freq Offset, the exported data will contain
the trace data with the offset applied. Therefore, if that trace were to be imported
back into the instrument, you would want Freq Offset to be 0, or the offset would
be applied again to data which is already offset. No such care need be taken
632 Spectrum Analyzer Mode User's &Programmer's Reference
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